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MUX507: Voltage input to analog input pins when VDD=0 case

Oba
Genius 15750 points
Part Number: MUX507
Other Parts Discussed in Thread: TMUX8108, TMUX7308F, MPC506

Hello,

 

I have a question for MUX507.

 

The datasheet specifies absolute max input voltage to Analog pins as Vss-2 ~ VDD+2.

And there is a note, “Voltage limits are valid if current is limited to +-30mA”.

 

When 2V is input to an analog pin without any additional current limit when VDD=0V, is there a possibility that over 30mA flows on the analog pin?

Is there a ESD diode or something on analog input pins through VDD?

 

Regards,
Oba

  • +1
    TI__Mastermind 23373 points

    Hey Oba, 

    There is an ESD diode from the analog input pints through VDD (no powered off protection) that will be forward biased with the 2V input so you shouldn't be applying a voltage to the device when Vdd = 0V which is also in accordance with the recommended specs of the datasheet. 

    The MPC506 is a 16:1 device that has powered off protection which can support up to 16V. If this is too low for your voltage range, you could also use a couple 8:1 devices, like the TMUX7308F or TMUX8108 that have powered off protection, in parallel with the outputs tied together to have the same functionality. 

    Thanks,
    Rami